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Gets the up bars for a line chart group.
Up bars connect points where the last series in the chart group has a higher value than the first series. This property applies only to line charts.
IChartBars UpBars { get; }
ReadOnly Property UpBars As IChartBars
worksheet.Range["A1:C4"].Value = new object[,] {
{"Month", "Planned", "Actual"},
{"Jan", 10, 14},
{"Feb", 18, 12},
{"Mar", 15, 20}
};
IChart chart = worksheet.Shapes.AddChart(ChartType.Line, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:C4"], RowCol.Columns, true, true);
IChartGroup chartGroup = chart.ChartGroups[0];
chartGroup.HasUpDownBars = true;
IChartBars upBars = chartGroup.UpBars;